[CAUT] Aluminum hammer rail (Screw hole) repair

[Jim Busby]

David,

 

Yamaha teaches to carefully do the "backwards feel" thread thing, but if
it does strip they sell oversized screws. If the oversized screw strips
out (Yes, we did have a gorilla working for us a while back) then they
will sell you a new rail. 

 

That's when I found the heli coils to be valuable. 

 

Regards,

Jim Busby

 

________________________________

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
David Ilvedson
Sent: Wednesday, June 27, 2007 6:01 PM
To: caut at ptg.org
Subject: Re: [CAUT] Aluminum hammer rail (Screw hole) repair

 

Seems to me Yamaha would have a good solution...

David Ilvedson, RPT
Pacifica, CA 94044

________________________________

Original message
From: "Mark Cramer"  
To: "College and University Technicians"  
Received: 6/27/2007 9:33:35 AM
Subject: Re: [CAUT] Aluminum hammer rail (Screw hole) repair

How timely Barbara and Jim, I'm just traveling a new set of S/F's on a
1976 C-7 and found a stripped hole in the bass.

  

Can you suggest a place to look for this kit... auto supplies, etc? Does
it have a parts number, or go by the thread size?

  

Otherwise, I seem to recall someone suggesting there was a nominal
upsize thread (imperial or metric?) that could be used.

  

thanks,

Mark Cramer

Brandon University

  

PS The alignment groove in the aftermarket parts I'm using doesn't quite
line up with the wire Yamaha recesses into their action rails. This
pulls the flange away from the lip that the flanges butt against, making
it difficult to get a nice alignment.

  

Fortunately, there's a recess in that lip, and I was ABEL to thread a
peice of #16 music wire between and the flange. Now I'm left with about
a .25mm gap between the lip and the flange, but at least it's precise.

  

     

 

	-----Original Message-----
	From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org]On
Behalf Of Barbara Richmond
	Sent: Wednesday, June 27, 2007 10:34 AM
	To: College and University Technicians
	Subject: Re: [CAUT] Aluminum hammer rail (Screw hole) repair

	Hi Jim,

	  

	I bought the Recoil kit, but it has no screws in it.  What
screws did you use?  

	  

	John Dewey also mentioned this repair in his class, Action Frame
Diagnosis and Repair, so, if it is OK with you, I will also list him on
the submission since I am putting together a special "TT&T goes to the
convention."

	  

	Thanks,

	  

	Barbara

		----- Original Message ----- 

		From: Jim Busby <mailto:jim_busby at byu.edu>  

		To: College and University Technicians
<mailto:caut at ptg.org>  

		Sent: Thursday, January 25, 2007 3:58 PM

		Subject: [CAUT] Aluminum hammer rail (Screw hole) repair

		  

		List,

		 

		Here's a way to repair stripped screw holes (Especially
if an oversized screw strips) in an aluminum rail that takes less than a
minute or two. "Helicoils" is what they are called. (See attached pic.) 

		 

		You drill out the hole and tap it, then insert the
little coil which disappears into the tapped threads, and then you're
good to go! Maybe this has been shown on CAUT before, I don't remember
seeing it. The new screw is actually a machine screw with fine threads
so it takes a few more rotations, but this is way better than anything
else I've ever tried. The package shows a bolt, but what actually goes
in has a Phillips head and looks like a normal screw.

		 

		Jim Busby RPT

		BYU

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